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Vehicle emissions are a major source of precursors for SOA, thus estimating the potential for SOA formation from vehicle emissions is desirable. Colleagues at CE-CERT conducted concurrent studies to measure the SOA formed from the eight fuels. A strong trend between the PMI and the SOA formed was observed. However, this trend was not sufficiently robust to use PMI alone as a predictor for SOA formation. A modification of the PMI was developed, the secondary PMI, by weighting the PMI factor for each of the compound classes based on the contribution of each class to potential SOA formation vs. PMI. Application of this secondary PMI demonstrated the potential for SOA formation to be estimated as a function of fuel composition. Future studies will be needed to refine development and define applicability limits of the secondary PMI.
All tailpipes emit a wide variety of liquid- and solid-phase particles. They are omnipresent; but being small and in trace quantities, they are usually emitted unseen - we become aware of them only through the visible testimony of smoke. Particulate emissions engender serious ramifications for public health, amenity and the wider environment. Historically it is diesel engines that have been singled out for stricture, but today this makes less sense, as their particulate emissions are now approaching parity with gasoline engines. For 30 years, the legal requirement has been solely to reduce the total mass of particles emitted, but mass as a toxological indicator is being increasingly questioned, with other metrics proposed, such as: particle size, number and composition. This shift of perspective has far-reaching repercussions for the automotive industry, because new ways of characterising and controlling emissions of particulate will have to be sought. This book aims to distil all the available informatiion into a single treatise.
The public health risks posed by automotive particulate emissions are well known. Such particles are sufficiently small to reach the deepest regions of the lungs; and moreover act as carriers for many potentially toxic substances. Historically, diesel engines have been singled out in this regard, but recent research shows the need to consider particulate emissions from gasoline engines as well. Already implicated in more than one respiratory disease, the strongest evidence in recent times points to particle-mediated cardiovascular disorders (strokes and heart attacks). Accordingly, legislation limiting particulate emissions is becoming increasingly stringent, placing great pressure on the automotive industry to produce cleaner vehicles - pressure only heightened by the ever-increasing number of cars on our roads. Particulate Emissions from Vehicles addresses a field of increased international interest and research activity; discusses the impact of new legislation globally on the automotive industry; and explains new ways of measuring particle size, number and composition that are currently under development. The expert analysis and summary of the state-of-the-art, which encompasses the key areas of combustion performance, measurement techniques and toxicology, will appeal to R&D practitioners and engineers working in the automotive industry and related mechanical fields, as well as postgraduate students and researchers of engine technology, air pollution and life/ environmental science. The public health aspects will also appeal to the biomedical research community.